I have an 02 SL1 with 266k miles. The hex nut that holds the transmission cooler fitting to the inside of the radiator is rusted and coolant is leaking. I have read a number of posts regarding leaky trans cooler lines, but most seem to say the radiator needs to be replaced. If the experts agree that is the best course, I will do that. It just seems that the nut was definitely rusted out(stamped metal) and not holding much. I should be able to replace that nut, possibly add a new rubber gasket under the nut and tight to the fitting, possibly teflon tape, and it would tighten up. I'm guessing there is also a sealing gasket already on the fitting that seals agains the inside face of the hole in the radiator. I don't see the radiator is cracked anywhere. Has anyone had any experience just replacing that nut? Any recommendations? I should mention, the leak is on the lower line. The nut probably cost a couple bucks, the radiator to buy locally is $100. I don't want to replace the nut, and find it leaking again after a few days either.

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I have an 02 SL1 with 266k miles. The hex nut that holds the transmission cooler fitting to the inside of the radiator is rusted and coolant is leaking. I have read a number of posts regarding leaky trans cooler lines, but most seem to say the radiator needs to be replaced. If the experts agree that is the best course, I will do that. It just seems that the nut was definitely rusted out(stamped metal) and not holding much. I should be able to replace that nut, possibly add a new rubber gasket under the nut and tight to the fitting, possibly teflon tape, and it would tighten up. I'm guessing there is also a sealing gasket already on the fitting that seals agains the inside face of the hole in the radiator. I don't see the radiator is cracked anywhere. Has anyone had any experience just replacing that nut? Any recommendations? I should mention, the leak is on the lower line. The nut probably cost a couple bucks, the radiator to buy locally is $100. I don't want to replace the nut, and find it leaking again after a few days either.

I remember reading that there was someone here in the past that tried to replace the nut and did not hold. These radiators normally crack right there anyways. Do yourself a favor and buy a new radiator and only buy Sella or Delphi, as these are the only ones that will last long. The others may last a couple of years.

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You probably will never get the lower transmission line off the radiator to replace the nut without causing a crack sooo....
Under $50. It's a Silla. Free shipping to your door. Buy it. Replace it, done! I did it in short order on a Saturday. Don't screw with it. Just swap it out. Be happy!http://www.amazon.com/Shepherd-Auto-...n+sl1+radiator

See if you can bust the transmission lines loose from the radiator before you start. Won't budge? [I suspect they won't on a New England car]buy new lines also. On the trans-axle side they connect with a quick release fitting.